... Almost didn't. My friends stopped me from having him killed.

[Deeeep breath.]

When I had the chance again, I took away his power instead. [There's another pause, where he debates the merits of explaining the next part.]

Callaghan's daughter had been lost in an experiment with portal teleportation. She wasn't dead, she was inside the portal... Baymax, the robotic nurse Tadashi built, found her inside. We went in after her, and just barely got her out in time. She lived... Callaghan got to see her when the medics took her away.